very confused about light pink discharge

Gabi
Hi ladies! I'm so confused and need some help. 
About 1-2 weeks ago I wiped and had very faint pink discharge. Not a lot even, just enough to notice. I thought it was weird because I was in the middle of my pill pack. Forward to today, I'm in the middle of my inactive week and period is expected to start Friday, and it happened again. 
So it's only happened twice, but they were 1-2 weeks apart? I don't remember exactly what day the first one was but it's in between there. It seems strange because implantation bleeding only happens once (or at most the course of a few days) and ovulation bleeding is obvi during ovulation ...but I shouldn't even be ovulating? 
Could it be some other cause and should I go to the doctor?